User's Manual

WESROC
®
RMS Industrial CTM - Operation Manual - Independent Technologies, Inc.
72-70-209, Rev. A Page 12 01/18/2017
Tank Level Measurement
The CTM wakes up and measures the level of the tank contents once per minute. This
enables the CTM to be very responsive to changing tank level conditions and to more
accurately qualify events such as tank fills or tank draws. The tank level is reported in a
number ranging from 0 to 99, representing the tank level in percent full. This is the
predominant measurement unit in the propane industry, and also serves well when
monitoring low pressure fuels such as gasoline, diesel fuel, heating oil, etc.
Tank Level Events and Conditions
The CTM tracks and qualifies a number of different tank level events and conditions.
Qualification of a tank level event or condition will cause the CTM to report to the Host
ahead of its scheduled report time. A tank level event such as a tank fill is a one time
event and will be reported and then cleared from the tank status. A tank level condition
such as a low tank level will be reported, but will not be cleared from the tank status until
the condition is no longer true. The following is a summary of the tank level events and
conditions supported by the CTM. The configuration parameters referred to in this section
can be referenced in the “Application Configuration” section of this document.
Tank Fill Event:
A tank fill event will be qualified by the CTM when the tank level increases by the
configured amount.
Tank Draw Event:
A tank draw event will be qualified by the CTM when the tank level has decreased by the
configured amount within one hour. A tank draw event will NOT be qualified if the tank
level has dropped to 0% (bad or missing sensor).
Tank Level Change Event:
A tank level change event will be qualified by the CTM when the tank level has moved
above or below the configured tank level change threshold since the last report to the
Host. This threshold can be positive or negative, depending on if the user is looking to
track a rising or falling tank level.
Tank Critical High Condition:
A tank critical high condition will be qualified by the CTM when the tank level has risen
above the configured tank critical high threshold.
Tank Warning High Condition:
A tank warning high condition will be qualified by the CTM when the tank level has risen
above the configured tank warning high threshold.
Tank Warning Low Condition:
A tank warning low condition will be qualified by the CTM when the tank level has dropped
below the configured tank warning low threshold.